VIDEO: http://www.youtube.com/watch?v=G3vrZeJoqTE

I spent the 16th roaming around Southeast Wyoming observing upslope flow severe thunderstorms.  There were a few supercells and I found 2.25 inch hail with one near Jay Em, Wyoming.

On the morning of the 17th, a strong upper level low was located over the Central Rockies.  A short wave trough and 500mb wind speeds of 60+ knots was forecast to swing around the east side of this low resulting in strong lift and favorable shear over Nebraska.  At daybreak, a deep surface low was located over Eastern Colorado and a front extended eastward along the Kansas/Nebraska border.  Dewpoint temperatures in the low 60’s were flowing westward north of the front through the North Platte area.
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Not surprisingly, the Southwest Nebraska area was prime for supercell and tornado development by afternoon.  The storm that produced the Brady tornado was small and LP during its early life.  This almost had me looking past it when it was organizing in Frontier County.  But the structure looked good from the start and that was enough to hold my attention.  As the storm moved to the northwest and approached I-80, its size increased and it was obviously rotating.

I got to I-80 at Gothenburg and had to study just what was taking place.  The storm to my west was getting farther away!  Luckily I had I-80 to take me northwest toward Brady.  Not long after I started westbound, a tornado became visible.  This tornado grew very large, reaching about 1000 yards wide as it moved northwest and finally due west toward the end of its life.  The storm structure was amazing.

A small tornado was also produced near Maxwell before the storm weakened quickly.